IEEE Trans Ultrason Ferroelectr Freq Control. 2016 Oct;63(10):1593-1600. doi: 10.1109/TUFFC.2016.2608759. Epub 2016 Sep 12.
This paper presents a contactless, acoustic technique to manipulate and sort particles of varying size in both liquid and air media. An acoustic standing wave is generated by the superposition of counterpropagating waves emitted by two opposing emitters. The acoustic radiation force traps the smallest particles at the pressure nodes of the acoustic standing wave. The position of the particles can be manipulated by dynamically changing the phase difference between the two emitters. By applying a dynamic acoustic field (DAF), it is demonstrated that particles can be manipulated spatially and sorted according to size. The discrimination (sorting dynamic range) capability is initially demonstrated in liquid media by separating three different sets of polystyrene particles, ranging in size from 5 to 45μm in diameter. The separation between particles was performed up to a ratio of 5/6 in diameter (20% diameter difference). Finally, the scalability of the DAF method is demonstrated by sorting expanded polystyrene particles of 2 and 5 mm diameter in air.
本文提出了一种非接触式、声学技术，用于在液体和气体介质中操纵和分类不同大小的颗粒。通过两个相对的发射器发射的反向波的叠加产生声驻波。声辐射力将最小的颗粒困在声驻波的压力节点处。通过动态改变两个发射器之间的相位差，可以操纵颗粒的位置。通过施加动态声场（DAF），可以证明可以根据大小对颗粒进行空间操纵和分类。通过在液体介质中分离三组不同的聚苯乙烯颗粒（直径分别为 5 至 45μm），最初演示了该技术的区分（分类动态范围）能力。在直径比为 5/6（20%直径差异）的情况下可以实现颗粒分离。最后，通过在空气中对 2 毫米和 5 毫米直径的膨胀聚苯乙烯颗粒进行分类，证明了 DAF 方法的可扩展性。
